Improvement in mode of fastening teeth



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Laim Patent No. 74,237, dated February 11, 1ste.

IMPROVEMENI' IN MODE 0I FASTENING TEBIH.

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TO ALL WHOM IT MAY GONCERN: A Be it known that I, JOHN A. MASON, of Keokuk, in the county of Lee, and State of Iowa, have invented a new and improved Fastening for Artificial Teeth; and I do hereby declare that the following is a full,'cleu-r, and exact description thereof, reference being had to the accompanyingdrawings, making' part of this specification, in which" Figur-e1 is a perspective view, showing a tooth attached to its base. I

Figure 2 is an enlarged sectional view of a. tooth with -my improved fastening applied to it.

Figure 3 is a view of the inner part oi' the tooth and its improved fastening.

Figure 4 is a perspective view of the improved fastening detached from a tdoth.

Figure 5 is a cross-section of a tooth in perspective, Vshowing the old mode of applying fastenings.

Similailetters of reference indicate corresponding parts in the several figures.'

This invention relates to a new and improved method of applying metallic fastenings to artificial teeth, vwhereby I secure a much stronger attachmentof' thc teeth to their rubber base, reduce the amount of rubber hitherto found necessary about the cutting-edges of the teeth, and make a much rmer attachment ofthe teeth to their rubberl base than has been heretofore attained. i

The nature of myinvention consists in the insertion of metallic` fastenlngs into tbeb'odylof the teeth in planes at right angles to the width thereof, and in having those portions of the fastenings which pro-ject from the teeth to be inserted into the plate or rubber base, arranged at right angles to those portions which enter the teeth, as will be hereinafter described.

A To enable others skilled in the art to understand my invention, I will describe its construction andoperation:

In the accompanying drawings I have' represented a fastening consisting of-two V-shaped wires linked together and secured'at right angles to`each other. These two staples a a present fou-r attaching-ends, which latter may be swelled or enlarged, 'as shown, for the purpose of aiording a better hold in the substances into' which they are embedded. Instead of employing the'links or staples as shown, the fastenings may be stamped from a thin plate of metal, and so shaped as to present but three attaching-ends, in which` case the pointsshonld i be bent or formed so as to present right-angular attachments, substantially as shown in .the drawings.; The

staple a is embedded into the tooth A in the operation of moulding the tooth, or in any other suitable manner, so that Ithe two ends of this staple shall be in a. plane lengthwise ot' the tooth, as shown in iig. 2 i this leaves the staple a', which-is intended for insertion into the rubber base B, in a plane which is at rightangle's to the length of the tooth, as shown in-g. 3:

In tig. 5, I have shown the mode heretofore adopted of inserting fastening-pins into teeth, wherein it will be seen that the pins are arranged in afplane at right angles to the length of the tooth, which arrangement greatly impairs the strength f the tooth, and renders it very Yliable to break at the point of insertion of the pins.

'By having the fastening,'which is inserted intotho tooth, in a; planewhch is lengthwise of the tooth', and the fastening which projects from the tooth arranged at right-angles to the length of the tooth, as shown and- `described, I securei the following advantages over all other modes of attachment: The tooth is not liable to break crosswise of its length, vbecause the pins in the tooth are not in the same transverse plane; and the fastening a can bc'secnred iirmly into the rubber, or `other base-plate, without having too great a thickness of rubber 'in contact with the tooth. Where those portions of the fastenings which project from the teeth have been arranged i'niplaues coinciding. with the length of the teeth, or at right anglesto the fastenings a', shown in gs. 2 and 3, it requires too great `a thickness of rubber near 'the cutting-edges df the -teethfto receive these'fastening-s. The

fastening a', beingrarranged at right angles to the fastening a, can be embedded iirmlyinto the rubbei-,nor other p suitable base, without having too great a thickness of rubber in contactwith the tooth.;V The same result can be attained by using a broad pin, inserted into the tooth longitudinally thereof, and bending the projecting portion of such pin so that it can be inserted latitudinally into the rubber base. V'Ihe `same result may be obtained by inserting pins lengthwise 'of thetooth whenthey are monlded, and afterward securing the projection which enters the rubber base to said pins by bending and pressing down their projecting `ends. v

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is` y The construction of fastenings for 4artirioial teeth, substantially in the manner and for thep'urposes described.

` l 'JOHN A. MASON. Witnesses:

J. D. Fnnnnn, J. P. Hoamsu. 

